--- /dev/null
+/*
+ * Ethernet on Serial Communications Controller (SCC) driver for Motorola MPC8xx and MPC82xx.
+ *
+ * Copyright (c) 2003 Intracom S.A.
+ * by Pantelis Antoniou <panto@intracom.gr>
+ *
+ * 2005 (c) MontaVista Software, Inc.
+ * Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/bitops.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_8xx
+#include <asm/8xx_immap.h>
+#include <asm/pgtable.h>
+#include <asm/cpm1.h>
+#endif
+
+#include "fs_enet.h"
+
+/*************************************************/
+#if defined(CONFIG_CPM1)
+/* for a 8xx __raw_xxx's are sufficient */
+#define __fs_out32(addr, x) __raw_writel(x, addr)
+#define __fs_out16(addr, x) __raw_writew(x, addr)
+#define __fs_out8(addr, x) __raw_writeb(x, addr)
+#define __fs_in32(addr) __raw_readl(addr)
+#define __fs_in16(addr) __raw_readw(addr)
+#define __fs_in8(addr) __raw_readb(addr)
+#else
+/* for others play it safe */
+#define __fs_out32(addr, x) out_be32(addr, x)
+#define __fs_out16(addr, x) out_be16(addr, x)
+#define __fs_in32(addr) in_be32(addr)
+#define __fs_in16(addr) in_be16(addr)
+#define __fs_out8(addr, x) out_8(addr, x)
+#define __fs_in8(addr) in_8(addr)
+#endif
+
+/* write, read, set bits, clear bits */
+#define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
+#define R32(_p, _m) __fs_in32(&(_p)->_m)
+#define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
+#define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))
+
+#define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))
+#define R16(_p, _m) __fs_in16(&(_p)->_m)
+#define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
+#define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))
+
+#define W8(_p, _m, _v) __fs_out8(&(_p)->_m, (_v))
+#define R8(_p, _m) __fs_in8(&(_p)->_m)
+#define S8(_p, _m, _v) W8(_p, _m, R8(_p, _m) | (_v))
+#define C8(_p, _m, _v) W8(_p, _m, R8(_p, _m) & ~(_v))
+
+#define SCC_MAX_MULTICAST_ADDRS 64
+
+/*
+ * Delay to wait for SCC reset command to complete (in us)
+ */
+#define SCC_RESET_DELAY 50
+
+static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
+{
+ const struct fs_platform_info *fpi = fep->fpi;
+
+ return cpm_command(fpi->cp_command, op);
+}
+
+static int do_pd_setup(struct fs_enet_private *fep)
+{
+ struct platform_device *ofdev = to_platform_device(fep->dev);
+
+ fep->interrupt = irq_of_parse_and_map(ofdev->dev.of_node, 0);
+ if (fep->interrupt == NO_IRQ)
+ return -EINVAL;
+
+ fep->scc.sccp = of_iomap(ofdev->dev.of_node, 0);
+ if (!fep->scc.sccp)
+ return -EINVAL;
+
+ fep->scc.ep = of_iomap(ofdev->dev.of_node, 1);
+ if (!fep->scc.ep) {
+ iounmap(fep->scc.sccp);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+#define SCC_NAPI_RX_EVENT_MSK (SCCE_ENET_RXF | SCCE_ENET_RXB)
+#define SCC_NAPI_TX_EVENT_MSK (SCCE_ENET_TXB)
+#define SCC_RX_EVENT (SCCE_ENET_RXF)
+#define SCC_TX_EVENT (SCCE_ENET_TXB)
+#define SCC_ERR_EVENT_MSK (SCCE_ENET_TXE | SCCE_ENET_BSY)
+
+static int setup_data(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+
+ do_pd_setup(fep);
+
+ fep->scc.hthi = 0;
+ fep->scc.htlo = 0;
+
+ fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
+ fep->ev_napi_tx = SCC_NAPI_TX_EVENT_MSK;
+ fep->ev_rx = SCC_RX_EVENT;
+ fep->ev_tx = SCC_TX_EVENT | SCCE_ENET_TXE;
+ fep->ev_err = SCC_ERR_EVENT_MSK;
+
+ return 0;
+}
+
+static int allocate_bd(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ const struct fs_platform_info *fpi = fep->fpi;
+
+ fep->ring_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
+ sizeof(cbd_t), 8);
+ if (IS_ERR_VALUE(fep->ring_mem_addr))
+ return -ENOMEM;
+
+ fep->ring_base = (void __iomem __force*)
+ cpm_dpram_addr(fep->ring_mem_addr);
+
+ return 0;
+}
+
+static void free_bd(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+
+ if (fep->ring_base)
+ cpm_dpfree(fep->ring_mem_addr);
+}
+
+static void cleanup_data(struct net_device *dev)
+{
+ /* nothing */
+}
+
+static void set_promiscuous_mode(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ S16(sccp, scc_psmr, SCC_PSMR_PRO);
+}
+
+static void set_multicast_start(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_enet_t __iomem *ep = fep->scc.ep;
+
+ W16(ep, sen_gaddr1, 0);
+ W16(ep, sen_gaddr2, 0);
+ W16(ep, sen_gaddr3, 0);
+ W16(ep, sen_gaddr4, 0);
+}
+
+static void set_multicast_one(struct net_device *dev, const u8 * mac)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_enet_t __iomem *ep = fep->scc.ep;
+ u16 taddrh, taddrm, taddrl;
+
+ taddrh = ((u16) mac[5] << 8) | mac[4];
+ taddrm = ((u16) mac[3] << 8) | mac[2];
+ taddrl = ((u16) mac[1] << 8) | mac[0];
+
+ W16(ep, sen_taddrh, taddrh);
+ W16(ep, sen_taddrm, taddrm);
+ W16(ep, sen_taddrl, taddrl);
+ scc_cr_cmd(fep, CPM_CR_SET_GADDR);
+}
+
+static void set_multicast_finish(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+ scc_enet_t __iomem *ep = fep->scc.ep;
+
+ /* clear promiscuous always */
+ C16(sccp, scc_psmr, SCC_PSMR_PRO);
+
+ /* if all multi or too many multicasts; just enable all */
+ if ((dev->flags & IFF_ALLMULTI) != 0 ||
+ netdev_mc_count(dev) > SCC_MAX_MULTICAST_ADDRS) {
+
+ W16(ep, sen_gaddr1, 0xffff);
+ W16(ep, sen_gaddr2, 0xffff);
+ W16(ep, sen_gaddr3, 0xffff);
+ W16(ep, sen_gaddr4, 0xffff);
+ }
+}
+
+static void set_multicast_list(struct net_device *dev)
+{
+ struct netdev_hw_addr *ha;
+
+ if ((dev->flags & IFF_PROMISC) == 0) {
+ set_multicast_start(dev);
+ netdev_for_each_mc_addr(ha, dev)
+ set_multicast_one(dev, ha->addr);
+ set_multicast_finish(dev);
+ } else
+ set_promiscuous_mode(dev);
+}
+
+/*
+ * This function is called to start or restart the FEC during a link
+ * change. This only happens when switching between half and full
+ * duplex.
+ */
+static void restart(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+ scc_enet_t __iomem *ep = fep->scc.ep;
+ const struct fs_platform_info *fpi = fep->fpi;
+ u16 paddrh, paddrm, paddrl;
+ const unsigned char *mac;
+ int i;
+
+ C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+
+ /* clear everything (slow & steady does it) */
+ for (i = 0; i < sizeof(*ep); i++)
+ __fs_out8((u8 __iomem *)ep + i, 0);
+
+ /* point to bds */
+ W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
+ W16(ep, sen_genscc.scc_tbase,
+ fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);
+
+ /* Initialize function code registers for big-endian.
+ */
+#ifndef CONFIG_NOT_COHERENT_CACHE
+ W8(ep, sen_genscc.scc_rfcr, SCC_EB | SCC_GBL);
+ W8(ep, sen_genscc.scc_tfcr, SCC_EB | SCC_GBL);
+#else
+ W8(ep, sen_genscc.scc_rfcr, SCC_EB);
+ W8(ep, sen_genscc.scc_tfcr, SCC_EB);
+#endif
+
+ /* Set maximum bytes per receive buffer.
+ * This appears to be an Ethernet frame size, not the buffer
+ * fragment size. It must be a multiple of four.
+ */
+ W16(ep, sen_genscc.scc_mrblr, 0x5f0);
+
+ /* Set CRC preset and mask.
+ */
+ W32(ep, sen_cpres, 0xffffffff);
+ W32(ep, sen_cmask, 0xdebb20e3);
+
+ W32(ep, sen_crcec, 0); /* CRC Error counter */
+ W32(ep, sen_alec, 0); /* alignment error counter */
+ W32(ep, sen_disfc, 0); /* discard frame counter */
+
+ W16(ep, sen_pads, 0x8888); /* Tx short frame pad character */
+ W16(ep, sen_retlim, 15); /* Retry limit threshold */
+
+ W16(ep, sen_maxflr, 0x5ee); /* maximum frame length register */
+
+ W16(ep, sen_minflr, PKT_MINBUF_SIZE); /* minimum frame length register */
+
+ W16(ep, sen_maxd1, 0x000005f0); /* maximum DMA1 length */
+ W16(ep, sen_maxd2, 0x000005f0); /* maximum DMA2 length */
+
+ /* Clear hash tables.
+ */
+ W16(ep, sen_gaddr1, 0);
+ W16(ep, sen_gaddr2, 0);
+ W16(ep, sen_gaddr3, 0);
+ W16(ep, sen_gaddr4, 0);
+ W16(ep, sen_iaddr1, 0);
+ W16(ep, sen_iaddr2, 0);
+ W16(ep, sen_iaddr3, 0);
+ W16(ep, sen_iaddr4, 0);
+
+ /* set address
+ */
+ mac = dev->dev_addr;
+ paddrh = ((u16) mac[5] << 8) | mac[4];
+ paddrm = ((u16) mac[3] << 8) | mac[2];
+ paddrl = ((u16) mac[1] << 8) | mac[0];
+
+ W16(ep, sen_paddrh, paddrh);
+ W16(ep, sen_paddrm, paddrm);
+ W16(ep, sen_paddrl, paddrl);
+
+ W16(ep, sen_pper, 0);
+ W16(ep, sen_taddrl, 0);
+ W16(ep, sen_taddrm, 0);
+ W16(ep, sen_taddrh, 0);
+
+ fs_init_bds(dev);
+
+ scc_cr_cmd(fep, CPM_CR_INIT_TRX);
+
+ W16(sccp, scc_scce, 0xffff);
+
+ /* Enable interrupts we wish to service.
+ */
+ W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
+
+ /* Set GSMR_H to enable all normal operating modes.
+ * Set GSMR_L to enable Ethernet to MC68160.
+ */
+ W32(sccp, scc_gsmrh, 0);
+ W32(sccp, scc_gsmrl,
+ SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
+ SCC_GSMRL_MODE_ENET);
+
+ /* Set sync/delimiters.
+ */
+ W16(sccp, scc_dsr, 0xd555);
+
+ /* Set processing mode. Use Ethernet CRC, catch broadcast, and
+ * start frame search 22 bit times after RENA.
+ */
+ W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
+
+ /* Set full duplex mode if needed */
+ if (fep->phydev->duplex)
+ S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
+
+ /* Restore multicast and promiscuous settings */
+ set_multicast_list(dev);
+
+ S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+}
+
+static void stop(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+ int i;
+
+ for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
+ udelay(1);
+
+ if (i == SCC_RESET_DELAY)
+ dev_warn(fep->dev, "SCC timeout on graceful transmit stop\n");
+
+ W16(sccp, scc_sccm, 0);
+ C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+
+ fs_cleanup_bds(dev);
+}
+
+static void napi_clear_rx_event(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
+}
+
+static void napi_enable_rx(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
+}
+
+static void napi_disable_rx(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
+}
+
+static void napi_clear_tx_event(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ W16(sccp, scc_scce, SCC_NAPI_TX_EVENT_MSK);
+}
+
+static void napi_enable_tx(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ S16(sccp, scc_sccm, SCC_NAPI_TX_EVENT_MSK);
+}
+
+static void napi_disable_tx(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ C16(sccp, scc_sccm, SCC_NAPI_TX_EVENT_MSK);
+}
+
+static void rx_bd_done(struct net_device *dev)
+{
+ /* nothing */
+}
+
+static void tx_kickstart(struct net_device *dev)
+{
+ /* nothing */
+}
+
+static u32 get_int_events(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ return (u32) R16(sccp, scc_scce);
+}
+
+static void clear_int_events(struct net_device *dev, u32 int_events)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+ scc_t __iomem *sccp = fep->scc.sccp;
+
+ W16(sccp, scc_scce, int_events & 0xffff);
+}
+
+static void ev_error(struct net_device *dev, u32 int_events)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+
+ dev_warn(fep->dev, "SCC ERROR(s) 0x%x\n", int_events);
+}
+
+static int get_regs(struct net_device *dev, void *p, int *sizep)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+
+ if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t __iomem *))
+ return -EINVAL;
+
+ memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
+ p = (char *)p + sizeof(scc_t);
+
+ memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t __iomem *));
+
+ return 0;
+}
+
+static int get_regs_len(struct net_device *dev)
+{
+ return sizeof(scc_t) + sizeof(scc_enet_t __iomem *);
+}
+
+static void tx_restart(struct net_device *dev)
+{
+ struct fs_enet_private *fep = netdev_priv(dev);
+
+ scc_cr_cmd(fep, CPM_CR_RESTART_TX);
+}
+
+
+
+/*************************************************************************/
+
+const struct fs_ops fs_scc_ops = {
+ .setup_data = setup_data,
+ .cleanup_data = cleanup_data,
+ .set_multicast_list = set_multicast_list,
+ .restart = restart,
+ .stop = stop,
+ .napi_clear_rx_event = napi_clear_rx_event,
+ .napi_enable_rx = napi_enable_rx,
+ .napi_disable_rx = napi_disable_rx,
+ .napi_clear_tx_event = napi_clear_tx_event,
+ .napi_enable_tx = napi_enable_tx,
+ .napi_disable_tx = napi_disable_tx,
+ .rx_bd_done = rx_bd_done,
+ .tx_kickstart = tx_kickstart,
+ .get_int_events = get_int_events,
+ .clear_int_events = clear_int_events,
+ .ev_error = ev_error,
+ .get_regs = get_regs,
+ .get_regs_len = get_regs_len,
+ .tx_restart = tx_restart,
+ .allocate_bd = allocate_bd,
+ .free_bd = free_bd,
+};
Code Review / kvmfornfv.git / blobdiff